The only implication is that I guess Air Southwest might move their handling contract at LGW away from BA! Still, given BA's approach to third-party handling at LGW over the last few years, they might see that as a bonus rather than a loss.
As I understand it WOW will move to the South Terminal and be handled by someone else in realction to BA's new NQY route. As for it being a bonus for WOW being handled by someone else, in terms of what they pay yes it may save them a few bob but no way will one of the generic handling conpanies such as Servisair/GlobeGround/Swissport/Circusair etc give the service BA do, especially in terms of in terminal handling.